I've started doing a lot of podcasts from local events, so I needed a really mobile rig. Then I saw
iRig Mic and instantly knew that was just what I was looking for. The quality is superb, on par with what I'm getting in my studio, all on my phone.
The coolest part of the mic is it is an electret condenser, so it has it's own infinite power, and it has 3 output levels. The first sounds like a -20dB pad to me, the second is normal output, and the third is amplified and compressed, which is perfect for recording from a distance, or capturing the sound from a whole room.